<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>border</title>
		<style>
			.box{
				width: 200px;
				height: 200px;
				/* border-top: 1px solid red; */
				/* border-bottom: ;
				border-left: ;
				border-right: ; */
				/* border: 1px solid #000; */
				/* border: 1px dashed #000; */
				/* border: 10px double #000; */
				border: 1px dotted #000;
			}
		</style>
	</head>
	<body>
		<div class="box"></div>
	</body>
</html>